Dh and I don't have kids, and love WDW and our DVC.
We've been to WDW several times as a couple. We love going at our own pace, and enjoying the attention to detail, fountains, landscaping, etc. We can be very mature and go to fine restaurants, or be 10 years old and ride Dumbo. It's our choice! We have a wonderful time.
I noticed one BIG thing when we went with my sisters WITH THEIR KIDS. -- It was really, really expensive for them.
Not having kids means that you can use fewer points per stay, pay less in admission, dining, transportation, etc. Just pay attention to the
point charts and purchase only what fits your needs/desires.
DO consider how the combination of DVC, Annual Passes, and possibly a kitchen will increase your mileage in making trips. (You may find that you can stay for 2 weeks instead of 1 now.)
One more thing -- addonitis is really contagious. In hindsight, Dh and I could have GOTTEN BY with 25 points (seriously), but are now just barely making it on our extraordinarilly small 100 point contract. We've discovered 1 bedrooms, weekends, and Hilton Head.
Good Luck!